Characteristics of optical glass lenses

We will continue to introduce the above knowledge about optical lenses. Today, the manufacturers of optical lenses will introduce the characteristics of optical glass lenses.

1, colorless optical glass lenses colorless glass lenses commonly known as white tablets, also known as white tablets. It can be divided into two kinds of ordinary and optical white pieces. The main composition of ordinary white tablets is sodium calcium silicate system, the refractive index is 1.51, the transmittance of visible light is more than 89%, and can absorb ultraviolet light below 280nm. The main composition of the optical white sheet is sodium calcium silicate system. The refractive index is 1.531, the Abbe number is 60.5, the transmittance is over 91%, and the UV protection performance is the worst. UV optical white film is the addition of a small amount of titanium oxide and cerium oxide in the components of the optical white film, so that it has the properties of ultraviolet absorption, the refractive index is 1.523, the Abbe number is 58.7, the transmittance is over 91%, and the ultraviolet light under 330nm can be absorbed. It has good mechanical and chemical stability. It is a white high quality lens which is widely used at home and abroad.

2, Crookes was invented by William Kroks in 1914, so it was called the "lens". The film is divided into two kinds: ordinary and optical. The plain film is called light gram for short, which adds trace amounts of cerium oxide, neodymium oxide and praseodymium oxide in the barium coronal glass. The lens has a obvious double color effect, which is light purple under the incandescent light and light blue blue under the fluorescent lamp. It can absorb the ultraviolet line below 340nm, the refractive index is 1.523, and the transmittance is 87%. Above。

3. The lens of Cruxite is also divided into two types: ordinary and optical lenses. The former is short for short, and the latter is short for short. The film is in the ordinary

A certain amount of selenium oxide was added to the white piece, making the color of the caddie was light pink, it could absorb ultraviolet light below 300nm, the refractive index was 1.510, and the transmittance was over 85%. The light match is the addition of manganese oxide and cerium oxide in the barium coronal glass. The color of the lens is light pink, the refractive index is 1.523, the transmittance is over 87%, and the ultraviolet light below 350nm can be absorbed.

4. The photochromic lens is abbreviated for discoloration. It is a compound of silver halide, which is added to the colorless or colored optical glass, so that the lens can be decomposed into silver and halogen atoms when ultraviolet radiation is irradiated, and the color of the lens is changed from shallow to deep. Conversely, when the light darkens, silver and halogen are combined to form a colorless silver halide, which makes the lens mesh back to the original colorless or primary color state. The chromotropic lens has two kinds of tea and gray change. It is characterized by both corrected vision and sunglasses, suitable for outdoor wear. In the 1986, a photochromic resin was developed, which permeates a layer of photochromic photosensitive material with the convex surface of the resin material, which is rapidly discoloring, not completely controlled by temperature, and will not be affected by the photometric effect, and the color depth of the central and surrounding areas is different.

5. The colored glass lens of the colored glass lens is to add various coloring agents in the colorless optical glass to make the glass different color, and selectively absorb or filter out the different monochromatic light. Its main purpose is to make light shading and various protective eyepiece, so that the eyes are not affected by harmful rays, wind sand, chemical drugs, poisonous gases and so on, and it can protect the eye. Common colored glass lenses are grey, Tan, green, blue, red and yellow.

(1) gray glass lenses are coloured with cobalt oxide, copper oxide, iron oxide and nickel oxide. It can absorb light evenly and absorb ultraviolet and infrared rays. It can be used as sunglasses, and suitable for drivers to wear.

(2) brown glass lenses are added with manganese oxide, iron oxide or nickel oxide. It has the function of absorbing ultraviolet rays and preventing glare. The objects are clear and clear, and can be used as sunglasses.

(3) green glass lenses are coloured with cobalt oxide, copper oxide, chromium oxide, iron oxide and cerium oxide. It has the function of absorbing ultraviolet and infrared rays, and can be used as goggles for gas welding, electric welding and argon arc welding.

(4) blue glass lenses are coloured with cobalt oxide, iron oxide, copper oxide and manganese oxide. It has the function of anti glare, and is suitable for the front goggles of high temperature furnace.

(5) red glass lenses were added with cadmium selenide and cadmium sulfide. It has the function of preventing the glare of the fluorescence, and is suitable for X light medical personnel's goggles.

(6) yellow glass lenses were added with cadmium sulfide, cerium oxide and titanium oxide coloring. It has the function of absorbing ultraviolet light, and the object is clear and bright. It can be suitable for drivers to wear in rainy and foggy weather.

6. High index of refraction

Lenses are also called "ultra thin lenses". Most of the domestic ultra-thin lenses are made of barium flint optical glass material with a refractive index of 1.7035, a specific gravity of 3.028, and Abbe number 41.6. Compared with the lenses of the crown glass, the thickness of the lenses is about 1/5 under the same diopter, especially for those with high refractive errors. However, due to the high lead oxide content, the specific gravity is large, and the Abbe number is also small. At present, titanium oxide is replaced by titanium oxide in high refractive index glass, and the optical coefficient of its specific gravity and ababe number have been improved, which make up the above shortcomings.